Update mental.json

plugins/mental.json

@@ -6,7 +6,7 @@
   "version": "0.5.b",
   "homepage": "https://github.com/Strum/Strums_Mental_VCV_Modules",
   "manual": "https://github.com/Strum/Strums_Mental_VCV_Modules/wiki/Mental-Modules-WIKI",
-  "source": "https://github.com/Strum/Strums_Mental_VCV_Modules"
+  "source": "https://github.com/Strum/Strums_Mental_VCV_Modules",
   "downloads": {
     "win": {
       "download": "https://github.com/Strum/Strums_Mental_VCV_Modules/releases/download/v0.5.b/mental-0.5.b-win.zip"